Forestomach motility in llamas and camels.

Major aspects of forestomach anatomy in llamas and camels are described. The pattern of forestomach motility is a succession of motoric cycles, consisting of A- and B-contraction sequences and a pause. Respective differences between llamas and camels are discussed. Observations on regulation of motility are mentioned. Occurrences and courses of rumination and eructation within the motility cycles are emphasized. Motility of the forestomach achieves a selective retention of feed particles in the forestomach; a long retention time is a prerequisite for an effective microbial digestion, especially of poor quality feed.